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United States Patent | 6,043,980 |
Katsui | March 28, 2000 |
The present invention relates to a heat sink. It is an object of the present invention to provide a heat sink at a low manufacturing cost, the life of the motor of which is long so that the reliability of the heat sink can be enhanced and, further, a sufficiently high cooling performance can be obtained and the designing of the heat sink can be easily performed. The heat sink includes: a bottom surface coming into contact with a heating element; a side on which a plurality of ventilation holes are formed; and an upper surface into which a cooling fan composed of blades and a motor is embedded and fixed.
Inventors: | Katsui; Tadashi (Kawasaki, JP) |
Assignee: | Fujitsu Limited (Kawasaki, JP) |
Appl. No.: | 001464 |
Filed: | December 31, 1997 |
Feb 24, 1997[JP] | 9-039485 | |
May 28, 1997[JP] | 9-138840 |
Current U.S. Class: | 361/695; 165/80.2; 165/80.3; 165/185; 174/15.2; 174/16.3; 174/252; 257/E23.099; 361/687; 361/690; 361/710; 361/722 |
Intern'l Class: | H05K 007/20 |
Field of Search: | 361/687,689,690-710,683,714-722 165/80.1,80.2,80.3,121,185,146,257,104.33,122 174/16.3,260,52.3,252 257/690-721,731 |
5272599 | Dec., 1993 | Koenen | 361/710. |
5377745 | Jan., 1995 | Hsieh | 165/80. |
5526875 | Jun., 1996 | Lin | 165/80. |
5583316 | Dec., 1996 | Kitahara et al. | 174/16. |
5594623 | Jan., 1997 | Schwegler | 361/697. |
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Abstract of Japanese Publication No. 8-017979. Abstract of Japanese Publication No. 8-321571. Abstract of Japanese Publication No. 5-304379. |